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Ensure compatibility with 2021 edition by working around cargo featur… #2902

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merged 1 commit into from
Sep 18, 2021

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weiznich
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…e resolver related breaking changes

Addresses #2753 as this will unfortunately become the new default in the 2021 edition (regardless that this seems to be in conflict with any of the guarantees given which changes are allowed at edition boundary)
CC rust-lang/rust#88903

@pksunkara
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Am I right in understanding that we don't need this change for master?

@weiznich
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The underlying problem happens because diesel is a direct and a build time dependency for diesel_migrations. The new feature resolver doesn't unify any features between those two diesel versions anymore, but it does unify features for diesel_derives. This leads to a situation where diesel_derives is generating code for the build time diesel version which depends on features that are disabled.
This cannot happen on master anymore as we removed the build time dependency on diesel from diesel_migrations.

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